Maserati Technical Bulletin

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Date: November 29th, 2016 Bulletin No. MAS001052 – Rear Differential                                                    Inspection_US Recall Campaign ‐ 328 Supersedes: N/A 

Model: Quattroporte (M156) and Ghibli (M157) Model Year: 2017 Subject: Vehicle Safety Recall Campaign 328 – Rear Differential Inspection 

 

PERFORM THE PROCEDURE OUTLINED IN THIS TECHNICAL BULLETIN ON ALL AFFECTED NEW VEHICLES BEFORE CUSTOMER DELIVERY OR FOR VEHICLES ALREADY SOLD AND DELIVERED THE NEXT TIME THE VEHICLE IS IN THE SHOP FOR MAINTENANCE OR REPAIRS. Maserati dealers must ensure recalls are completed after having been notified by Maserati North America, Inc. (MNA) that a safety-related defect or noncompliance exists in any motor vehicle or item of replacement equipment in the dealer’s possession at the time of notification. In MNA's case, this notification would typically be made by the issuance of a recall notification in the form of a Technical Bulletin. Under the National Traffic and Motor Vehicle Safety Act of 1966, as amended, if a recall campaign is announced by MNA, dealers must ensure that all recalls on new vehicles and new items of replacement equipment are completed BEFORE delivery to the consumer. This means that dealers may not legally deliver new motor vehicles or new items of replacement equipment to consumers with an open recall. The Safety Act also prohibits dealers from selling or leasing the motor vehicle or item of replacement equipment, unless and until the open recall has been completed BEFORE delivery. This also pertains to vehicles in the Certified Pre-Owned program, and to items of replacement equipment. Finally, MNA dealers should not sell or use parts that have been recalled by MNA. Please follow the specific instructions provided by MNA on the return or disposition of any parts.  

 

 

 

 

 

MASERATI SAFETY RECALL BULLETIN

  

 

2   MAS001052_Recall_328_Rear_Differential_Inspection

Description of Vehicle Safety Recall 328

Maserati S.p.A. and MNA have determined that the above described vehicles were manufactured with a rear differential unit pinion nut that was not torqued correctly. The function of the pinion nut is to provide the axial force required for proper location of the pinion within the differential unit bearing assemblies. A loose pinion nut will result in a reduction or total loss of axial force, as well as, insufficient orientation of the pinion itself. A loose pinion nut will potentially have an adverse effect on noise, vibration and harshness (NVH) performance, reduced gear, and bearing life, and can cause a differential fluid leak at the pinion seal. In the most severe cases of a loose pinion nut, axial loads could force the pinion into a differential gear binding condition, which can result in blocking the rotation of the ring gear, and potentially locking the rear wheels, thereby increasing the risk of a vehicle crash.

Which Vehicles Are Affected

Please refer to ModisCS+ and the attached VIN list at the end of this bulletin for the affected vehicles in the U.S.

Vehicle Remedy Information

1. Check that the vehicle is included in this Recall campaign, and that this repair has not been previously performed.

2. Inspect the rear differential pinion nut torque. If a replacement differential is needed, see attachment “A” at the end of this bulletin.

3. The recall procedure is now complete.

This repair procedure will be performed free of charge to the customer.

Parts Needed For The Recall

For this Recall campaign, the rear differential P/N: 670039125 (if needed), must be ordered from the Maserati Parts Department.

 

 

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6   MAS001052_Recall_328_Rear_Differential_Inspection

11. With a calibrated torque wrench, tighten the lock nut to 245 Nm. (Fig.12) NOTE: Make sure the axles / wheels do not turn during this stage.

Fig.12

12. Perform a visual inspection of the nut to make sure it has not moved (Fig.13). Compare it with the picture taken in step 10. If there was any movement of the nut, the differential must be replaced. Refer to section 3.21.001 – 00 of the Workshop Manual and attachment “A” in this bulletin.

Fig.13

NOTE: Only perform step 13 if the nut moved and the differential has to be replaced.

13. Perform a visual inspection of the drive shaft cover to make sure there are no bumps or protrusions that may alter the smoothness of the cover (Fig.14).

If any bumps or protrusions are found, the drive shaft must be replaced. If replacing the drive shaft, refer to section 3.30.001 of the Workshop Manual.

Fig.14

 

 

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8   MAS001052_Recall_328_Rear_Differential_Inspection

Attachment “A” (Replacing the Differential)

1. Replacing the rear differential a. Position a lift and place a block between the lift and differential. (Fig.1)

Fig.1 Fig.2 b. Using special tool p/n: 900000226 (Fig.2), remove the fastening bolts from the chassis to the differential. (Fig.3 and Fig.4)

Fig.3 Fig.4 c. Remove the lower bolt from the differential to the rear frame. (Fig.5)

Fig.5

  

 

9   MAS001052_Recall_328_Rear_Differential_Inspection

d. Lower the lift just enough so that you can carefully pry out the axles as shown in Fig.6 and Fig.7.

Fig.6 Fig.7 e. Slowly lower the lift while at the same time removing the axles. (Fig’s. 8 and 9)

Fig.8 Fig.9

3. Installing the rear differential a. Re-install all of the parts removed following the removal procedure in reverse order. b. Torque the lower bolt on the differential to the rear frame to 65 Nm. (Fig.10)

Fig.10

 

 

c. T c

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VIN

 

328_Rear_Dif

N List U.S.

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11